The ovaries respond  to pharmaceutical treatment by (usually) producing multiple follicles, which contain eggs. However, every woman is different and it is very common for the same dosage of the same drug to cause a different response to their ovaries. In some cases, few follicles are produced, while in others more follicles than expected develop . For this reason, the physician's experience is extremely important to shape and personalize the protocol, based on the latest research data.

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• Poor responders
• Hyperesponders